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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>
<script>
    class Person {
        say(){
            return "haha"
        }
        constructor(){
            this.age = 18;
        }
        name = "haha"
        
    }
    let a = new Person()
    a.name = "ohhuo"
    console.log(new Person())
</script>

</html>